eGFR Calculator Children

Bedside Schwartz Equation:

\[ eGFR = 0.413 \times \frac{Height}{Scr} \]

Estimated GFR (eGFR):

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1. What is the Bedside Schwartz Equation?

The Bedside Schwartz equation estimates glomerular filtration rate (GFR) in children using height and serum creatinine. It is specifically validated for pediatric populations and provides a quick, reliable assessment of kidney function in children.

2. How Does the Calculator Work?

The calculator uses the Bedside Schwartz equation:

\[ eGFR = 0.413 \times \frac{Height}{Scr} \]

Where:

\( Height \) — Child's height in centimeters (cm)
\( Scr \) — Serum creatinine in milligrams per deciliter (mg/dL)
\( 0.413 \) — Constant coefficient derived from pediatric population studies

Explanation: The equation leverages the strong correlation between height and muscle mass in children, providing a more accurate GFR estimation than adult formulas.

3. Importance of Pediatric eGFR Calculation

Details: Accurate GFR estimation in children is essential for detecting congenital kidney abnormalities, monitoring chronic kidney disease progression, adjusting medication doses, and evaluating kidney function after transplantation.

4. Using the Calculator

Tips: Enter height in centimeters and serum creatinine in mg/dL. Ensure measurements are recent and accurate. Height should be measured without shoes, and creatinine should be from a reliable laboratory test.

5. Frequently Asked Questions (FAQ)

Q1: What age range is this calculator suitable for?
A: The Bedside Schwartz equation is validated for children from 1 to 18 years old. For infants under 1 year, different equations may be more appropriate.

Q2: What are normal eGFR values in children?
A: Normal eGFR in children varies by age but generally ranges from 90-140 mL/min/1.73m². Values should be interpreted in context with the child's age and clinical condition.

Q3: Why use height instead of weight in this equation?
A: Height correlates better with muscle mass and kidney size in children, making it a more stable and reliable parameter for GFR estimation than weight.

Q4: Are there limitations to this equation?
A: The equation may be less accurate in children with extreme body habitus, muscle wasting diseases, amputations, or rapidly changing kidney function.

Q5: How often should eGFR be monitored in children?
A: Frequency depends on the clinical context - from every 3-6 months in stable CKD to more frequently during acute illness or medication changes.